Practice question

Gangetic Plains biogeographic zone formed by Quaternary alluvial deposition by Himalayan rivers Ganga, Yamuna, Ghaghara, Kosi, Gandak transporting vast silt over millions of years creating deep fertile tract extending Punjab to Bengal. Soil type predominantly alluvial entisol and inceptisol classified as khadar new floodplain annually inundated and bhangar older Pleistocene upland with kankar nodules. Alluvial soils loamy, high in potash, phosphoric acid, relatively low organic carbon, highly productive supporting intensive rice-wheat cropping system feeding over 400 million people. Remembering this distinction is crucial for solving taxonomy application questions in GATE and CSIR-NET life sciences papers.